My girlfriend and I were building the Nanoblock Neuschwanstein Castle Deluxe Edition Set, wich we really love, and we got this beacuase we read in some reviews that it's acctually a good thing to have when building Nanoblocks, that it's not just some extra gadget they want to sell to make an extra buck. You could manage to build the castle without it, but it does help! And now we have got the Tintin Unicorn Ship and we think we'll really have use for it with that set.
A bit expenive though, wich makes us give a 4 instead of 5.

These tweezers pick up nanoblocks very easily and they're a must-have for some of the more difficult sets like the Tokyo Skytree. I prefer using my hands most of the time but I use these tweezers a lot for the more difficult sets and even to just pull out blocks when they get stuck.

This is a must have for nano- blocking. These tweezers are unlike ordinary tweezers. It grabs the blocks properly and is very useful for dismantling or taking apart pieces that are incorrectly fixed. Highly recommend getting a pair, especially if you are really into nanoblocking.